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Draw to lines in your notebook line the ones below. What is true about the lines?

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Presentation on theme: "Draw to lines in your notebook line the ones below. What is true about the lines?"— Presentation transcript:

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2 Draw to lines in your notebook line the ones below. What is true about the lines?

3 THEY ARE PARALLEL. MARK THEM.

4 Draw a transversal. A transversal is a line that intersects two other lines.

5 Label the intersection points A & B.

6 Draw another transversal that intersects B.

7 What angles are equal in this picture? You do not have to write this down.

8 Write this down.  1   5 since they are corresponding angles.

9 Draw another transversal that intersect point B. What is a transversal again?

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11 Which angle is congruent to  9? Why?

12 Which angle is congruent to  9? Why?

13  9   11 since they are corresponding angles. Write this down.

14  9   11 since they are corresponding angles. Mark this in your diagram.

15 Are there other angles that are congruent?

16  15   16 because they are vertical angles.

17 What does this justify or prove? NCTMNCTM

18 THE SUM OF THE ANGLES IN A TRIANGLE ADD TO 180 

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20 Website regarding triangles Practice Problems: HW

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22 Triangles in Architecture

23 New design for a building in London; has not been completed yet.

24 Hearst Tower in Manhattan, New York

25 Close up view of the Hearst Tower.

26 The inside of a dome.

27 Truss bridges use the triangle — a very stable shape — to distribute load forces.

28 Howrah Bridge spans over the Hooghly River in West Bengal, India.

29 The Little Belt Bridge also known as The Old Little Belt Bridge, is a truss bridge over the Little Belt strait in Denmark.

30 The pyramids of Giza in Cairo, Egypt

31 Unitarian Meeting House built by Frank Lloyd Wright in Madison, Wisconsin.


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